Creep Of The Prestressed Concrete Structure, The Effect Of Computing Theory And Calculation Method

In order to guarantee the smoothness and stability of trains running in high-speed railway, the post creep deformation of ballastless track bridges should be strictly controlled. The question of how to control the post creep deformation of ballastless track long-span prestressed concrete bridge which is on Guang zhou -Zhu hai intercity rail traffic engineering was put forward . The mechanism of shrinkage and creep, the influences factors of shrinkage and creep, computing theory and method of creep and shrinkage effects in prestressed concrete ballastless track bridges have been studied .The major work in the paper is as follows:1. A mass of documents and the recently research results at home and abroad were collected and studied, the creep mechanisims and influential factors were discussed and summarized. The detail included the mechanism,factors considered, applicability and so on of the several prediction models.2. The creep coefficients according to the test results and the formularies of different current codes were compared. The creep coefficients of Chinese Highway 04 Code is recommended to analyze the post creep deformation of long-span prestressed concrete structure.3. Chinese Highway 04 Code expanded laboratory standard condition into considering temperature,humidity, cross section shape, loading-age and so on. It can be used to analyze Rong Gui Bridge.4.The creep effect analysis in prestressed concrete structure has been studied. Based on definition , a calculation formula of the creep effect with prestressed concrete bridge has been given. A computer program was compiled,and the results from computer program were compared with that of Doctor Bridge and Midas. The results showed that the Midas results is much closer to the results of the paper algorithm than DB. Therefore Midas software is recommended in analyzing the post creep deformation. The research results of this paper have been applied to the control and analysis of the post creep deformation of Rong Gui Bridge. Meanwhile , it can be as a reference for others same type bridges.